--- /dev/null
+#!/bin/sh
+# Copyright (C) 2006 Free Software Foundation, Inc.
+# This file is part of GCC.
+
+# GCC is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# GCC is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING. If not, write to
+# the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+# Boston MA 02110-1301, USA.
+
+# This script takes the following arguments:
+#
+# - the target sysroot
+# - the value of $(MULTILIB_MATCHES)
+# - the value of $(MULTILIB_OPTIONS)
+#
+# It uses these arguments to construct a definition of SYSROOT_SUFFIX_SPEC,
+# which it prints to the standard output. For each multilib directory FOO,
+# the script checks whether $sysroot has a subdirectory FOO, and if so will
+# use /FOO for all compatible command-line options. It will not add a
+# suffix for /FOO's options otherwise. These suffixes are concatenated,
+# with one subspec for each space-separated entry in $(MULTILIB_OPTIONS).
+set -e
+sysroot=$1
+matches=$2
+options=$3
+
+# For each multilib option OPT, add to $substs a sed command of the
+# form "-e 's/OPT/OPT/'".
+substs=""
+for option in `echo "$options" | tr '/' ' '`
+do
+ substs="$substs -e 's/$option/$option/g'"
+done
+
+# For each ALIAS=CANONICAL entry in $MULTILIB_MATCHES, look for sed
+# arguments in $substs of the form "-e 's/CANONICAL/.../'". Replace
+# such entries with "-e 's/CANONICAL/ALIAS|.../'". Both the ALIAS and
+# CANONICAL parts of $MULTILIB_MATCHES use '?' to stand for '='.
+#
+# After this loop, a command of the form "echo FOO | eval sed $substs"
+# will replace a canonical option FOO with a %{...}-style spec pattern.
+for match in $matches
+do
+ canonical=`echo "$match" | sed -e 's/=.*//' -e 's/?/=/g'`
+ alias=`echo "$match" | sed -e 's/.*=//' -e 's/?/=/g'`
+ substs=`echo "$substs" | sed -e "s,s/$canonical/,&$alias|,"`
+done
+
+# Build up the final SYSROOT_SUFFIX_SPEC in $spec.
+spec=
+for combo in $options
+do
+ # See which option alternatives in $combo have their own sysroot
+ # directory. Create a subspec of the form "%{PAT1:/DIR1;...;PATn:DIRn}"
+ # from each such option OPTi, where DIRi is the directory associated
+ # with OPTi and PATi is the result of passing OPTi through $substs.
+ subspec=
+ for option in `echo "$combo" | tr '/' ' '`
+ do
+ dir=`echo "$option" | sed 's/cpu=//'`
+ if test -d "$sysroot/$dir"; then
+ test -z "$subspec" || subspec="$subspec;"
+ subspec="$subspec"`echo "$option" | eval sed $substs`":/$dir"
+ fi
+ done
+ # Concatenate all the subspecs.
+ test -z "$subspec" || spec="$spec%{$subspec}"
+done
+if test -n "$spec"; then
+ echo "#undef SYSROOT_SUFFIX_SPEC"
+ echo "#define SYSROOT_SUFFIX_SPEC \"$spec\""
+fi
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